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Interactions non-linéaires d'ondes et tourbillons en milieu stratifié ou tournant

Abstract : Inertia-gravity waves play a major role in the global transfer of energy on Earth. Even if wave generation is well understood in the atmosphere and in the ocean, their subsequent evolution is not completely understood. These waves can interact nonlinearly with themselves and create small-scales structures that dissipate more rapidly. Motivated by this, the phenomenon of parametric subharmonic instability (PSI), was studied experimentally. We conducted the first laboratory demonstration of the interaction of three two-dimensional inertial plane waves, as a resonant triad. Inertia-gravity waves can also interact with, and create, mean flows of large scale that can modify the transport of energy, chemical and biological compounds, and thereby have an impact on biodiversity in the ocean. We therefore also demonstrated an experimental situation that gives rise to such a flow field and using a simplified theoretical model, we explained the formation of this flow. Finally, we performed some studies of vortices in stratified fluid, to assist future studies of the interaction of inertia-gravity waves with vortices.
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Submitted on : Tuesday, September 18, 2012 - 10:32:12 AM
Last modification on : Thursday, November 21, 2019 - 2:25:30 AM
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  • HAL Id : tel-00733175, version 1

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Guilhem Bordes. Interactions non-linéaires d'ondes et tourbillons en milieu stratifié ou tournant. Autre [cond-mat.other]. Ecole normale supérieure de lyon - ENS LYON, 2012. Français. ⟨NNT : 2012ENSL0731⟩. ⟨tel-00733175⟩

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